1 <!-- Loading jQuery before other libraries -->
 2 <script src="jquery.js"></script>
 3 <script src="prototype.js"></script>
 4 <script>
 5
 6     // Use full jQuery function name to reference jQuery
 7     jQuery(document).ready(function(){
 8      jQuery("div").hide();
 9    });
10
11     // Use the $ variable as defined in prototype.js
12     window.onload = function() {
13    var mainDiv = $('main');
14   };
15
16 </script>

 1 <!-- Putting jQuery into no-conflict mode -->
 2 <script src="prototype.js"></script>
 3 <script src="jquery.js"></script>
 4 <script>
 5     // $j is now an alias to the jQuery function;
 6     // creating the new alias is optional
 7     var $j = jQuery.noConflict();
 8     $j(document).ready(function(){
 9        $j("div").hide();
10      });
11
12     // The $ variable now has the prototype meaning,
13     // which is a shortcut for document.getElementById.
14     // mainDiv below is a DOM element, not a jQuery object
15     window.onload = function(){
16        var mainDiv = $('main');
17     }
18 </script>

 1 <!-- Another way to put jQuery into no-conflict mode -->
 2 <script src="prototype.js"></script>
 3 <script src="jquery.js"></script>
 4 <script>
 5
 6     jQuery.noConflict();
 7     jQuery(document).ready(function($){
 8        // You can use the locally-scoped $ in here as an alias to jQuery
 9        $("div").hide();
10      });
11
12     // The $ variable in the global scope has the prototype.js meaning
13     window.onload = function(){
14        var mainDiv = $('main');
15     }
16
17 </script>